Videocam gets power from PSU

This Beac DDV-1000 is a versatile device. It can be used as a webcam, voice recorder, videorecorder, camera, and a media player. It also has a port for transmitting video signal to TV screen, and also a port to  receive video signal, which can be seen through its 2.5" LCD screen and at the same time can record the video signal it receives from a mini-spy camera, wireless or not.
Unfortunately I lost its "commercially-unavailable" AC power adaptor at the airport (though it has a rechargeable dual polarity 3.6V battery source, it doesn't last long). So I dug out "hard-to-find" information from the internet on how to make a home-made power supply particularly with both positive and negative 3.6 volts, but to no avail. So, I just tried to use the (-)5 volt of the PSU from my old desktop PC, disregarding the possible damaging effect of using higher voltage, thinking I had no choice.
Luckily, it worked! ...but of course I don't know for how long...

I am modifying the wiring to connect it a small camera using a long LAN cable for home security.